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I am trying to reinstall Snow Leopard and I am putting the Snow Leopard CD using a Samsung External DVD Drive. The Snow Leopard Install CD boots up on every Mac except THIS ONE MAC. So I tried to boot the CD by restarting the computer and holding Option. Then I tried it by restarting and holding C. Then by restarting and holding Command. Then I tried holding Shift + Option + Command + Del. None of them worked; the DVD Drive is not listed as a boot up option ever.

I also tried going into system preferences and looking in startup disks but the external cd drive is not listed as an option.
When this Mac reads the snow leopoard CD from the drive, the CD is labelled "TSITFAT" and I get random exe files that cannot be read in Dos Mode. But when I use the Samsung external drive and put it on any other Mac, the Snow Leopard CD works perfectly.

I also have a bunch of ancillary problems. For one, when I go into System Preferences and click Network, System Preferences will freeze. Mac Airport also doesn't work in finding the Router (Airport Extreme), but for some reason it will recognize my iPhone when I use it as a wifi hotspot in PDAnet.